Loy Krathong is a traditional festival celebrated in Southeast Asia, especially in Thailand, on the full moon of the twelfth lunar month. Originating as a ritual to honor and seek forgiveness from the Hindu water goddess Ganga, the festival is deeply rooted in Thai culture but also reflects influences from ancient China and India. In Thailand, the festival involves floating decorated baskets, or "krathongs," as an offering to water deities, while neighboring countries hold similar ceremonies under different names, such as "Tazaungdaing" in Myanmar, "Il Full Moon Poya" in Sri Lanka, and the Lantern Festival in China.

Historically, Loy Krathong may date back to the Sukhothai era, with its development attributed to a Brahmanic ritual that evolved to incorporate Buddhist symbolism, including honoring the Buddha’s footprints with floating offerings. The festival has become a distinct part of Thai identity, often linked to the legend of Nang Nopphamat, who is believed to have crafted the first krathong during King Ramkhamhaeng’s reign.

The festival's form varies across Thai regions. In the north, the Yi Peng tradition involves releasing sky lanterns as a tribute to Buddha, while in the northeast, events like "Sammanakham Nam Khuen Pheng Seng Prateep" in Roi Et feature large-scale performances and cultural displays. In central Thailand, locations like Ayutthaya and Sukhothai offer grand celebrations with historical re-enactments and spectacular light displays. Meanwhile, unique traditions such as "Krathong Sai" in Tak province see participants releasing small floating baskets in sequences across rivers.

This annual event not only reflects religious devotion but also a historical blend of cultural beliefs—from ancestral spirit worship to Buddhist practices. Loy Krathong remains a vibrant, widely celebrated festival, bringing communities together to honor nature, family, and heritage.